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SubjectRe: [REGRESSION] v4.17-rc4: xgalaga fails to start in fullscreen (default) mode
On Wed, May 23, 2018 at 04:18:05PM +0300, Ville Syrjälä wrote:
> On Wed, May 23, 2018 at 02:49:19AM -0700, Vito Caputo wrote:
> > On Mon, May 21, 2018 at 02:57:18PM -0700, Vito Caputo wrote:
> > > On Mon, May 21, 2018 at 12:53:20PM -0700, Vito Caputo wrote:
> > > > Hello all,
> > > >
> > > > 4.17-rc4 (my latest kernel ATM) consistently fails to start xgalaga
> > > > without -window. I will try find time to build the latest rc this
> > > > evening.
> > > >
> > > > > ~$ xgalaga
> > > > > X Error of failed request: BadValue (integer parameter out of range for operation)
> > > > > Major opcode of failed request: 152 (XFree86-VidModeExtension)
> > > > > Minor opcode of failed request: 10 (XF86VidModeSwitchToMode)
> > > > > Value in failed request: 0x120004e
> > > > > Serial number of failed request: 199
> > > > > Current serial number in output stream: 203
> > > >
> > > > Haven't dug into this much yet, only did a perfunctory check by booting into a
> > > > few older kernels (4.11, 4.12, 4.16) and the problem is absent on all of them.
> > > > It appears to be a 4.17-specific regression right now.
> > > >
> > > > Also observed, though this is surely a different regression, the game
> > > > ran like molasses with -window, showing some prominent kworkers in top:
> > > >
> > > > 692 vc 20 0 312852 45884 20556 R 32.0 1.2 0:08.69 Xorg
> > > > 102 root 20 0 0 0 0 R 11.2 0.0 0:01.43 kworker/1:3
> > > > 94 root 20 0 0 0 0 I 8.9 0.0 0:00.83 kworker/0:2
> > > > 696 vc 20 0 39948 4124 2912 S 1.0 0.1 0:05.57 vwm
> > > > 902 vc 30 10 46372 4144 3500 S 0.7 0.1 0:00.08 xgalaga
> > > > 891 vc 30 10 44924 3868 3156 R 0.3 0.1 0:00.09 top
> > > > 903 vc 30 10 4180 1184 1100 S 0.3 0.0 0:00.01 xgal.sndsrv.oss
> > > >
> > > > The windowed performance issue was observed on the older kernels tested
> > > > as well, though 4.11 felt better and didn't have the busy kworkers.
> > > >
> > > > I have not attempted to play xgalaga for ages, but it used to be perfectly
> > > > playable on this machine in windowed mode when I last did.
> > > >
> > > > Machine is the venerable Thinkpad X61s, 1.8Ghz, Debian 9, config attached.
> > > >
> > >
> > > Just built and booted v4.17-rc6, still broken.
> >
> > Bisected to:
> >
> > e995ca0b8139c5f6807095464e969931b443f55a is the first bad commit
> > commit e995ca0b8139c5f6807095464e969931b443f55a
> > Author: Ville Syrjälä <ville.syrjala@linux.intel.com>
> > Date: Tue Nov 14 20:32:58 2017 +0200
> >
> > drm/i915: Provide a device level .mode_valid() hook
> >
> > We never support certain mode flags etc. Reject those early on in the
> > mode_config.mode_valid() hook. That allows us to remove some duplicated
> > checks from the connector .mode_valid() hooks, and it guarantees that
> > we never see those flags even from user mode as the
> > mode_config.mode_valid() hooks gets executed for those as well.
> >
> > Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> > Link: https://patchwork.freedesktop.org/patch/msgid/20171114183258.16976-11-ville.syrjala@linux.intel.com
> > Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
>
> Hmm. I guess xgalaga passes some garbage in via xf86vidmode which
> the ddx doesn't validate before passing it on to the kernel. So far
> I can't reproduce the problem here unfortnately.
>
> Can you try the following patch and reproduce the problem with
> drm.debug=0xe passed to the kernel so that we can seewhat the bad
> modeline looks like?
>

dmesg after xgalaga fails:

```
[ 75.617448] [drm:drm_mode_convert_umode] Bad user mode:
[ 75.617455] [drm:drm_mode_debug_printmodeline] Modeline 57:"800x600" 0 81000 800 832 928 1080 600 600 602 625 0x0 0x25
[ 75.617458] [drm:drm_mode_setcrtc] Invalid mode
```

xrandr --verbose:

```
Screen 0: minimum 320 x 200, current 1024 x 768, maximum 8192 x 8192
LVDS-1 connected primary 1024x768+0+0 (0x44) normal (normal left inverted right x axis y axis) 246mm x 184mm
Identifier: 0x41
Timestamp: 23375
Subpixel: horizontal rgb
Gamma: 1.0:1.0:1.0
Brightness: 1.0
Clones:
CRTC: 0
CRTCs: 0 1
Transform: 1.000000 0.000000 0.000000
0.000000 1.000000 0.000000
0.000000 0.000000 1.000000
filter:
EDID:
00ffffffffffff0030ae004000000000
3010010380191278eafe609555518726
22505421080001010101010101010101
01010101010128150040410026301888
3600f6b800000018ed10004041002630
18883600f6b9000000180000000f0061
43326143280f01000daf0714000000fe
004e31323158352d4c303620202000ed
scaling mode: Full aspect
supported: Full, Center, Full aspect
non-desktop: 0
range: (0, 1)
link-status: Good
supported: Good, Bad
1024x768 (0x44) 54.160MHz -HSync -VSync *current +preferred
h: width 1024 start 1048 end 1184 total 1344 skew 0 clock 40.30KHz
v: height 768 start 771 end 777 total 806 clock 50.00Hz
1024x768 (0x45) 65.000MHz -HSync -VSync
h: width 1024 start 1048 end 1184 total 1344 skew 0 clock 48.36KHz
v: height 768 start 771 end 777 total 806 clock 60.00Hz
1024x768 (0x46) 43.330MHz -HSync -VSync
h: width 1024 start 1048 end 1184 total 1344 skew 0 clock 32.24KHz
v: height 768 start 771 end 777 total 806 clock 40.00Hz
960x720 (0x47) 117.000MHz -HSync +VSync DoubleScan
h: width 960 start 1024 end 1128 total 1300 skew 0 clock 90.00KHz
v: height 720 start 720 end 722 total 750 clock 60.00Hz
928x696 (0x48) 109.150MHz -HSync +VSync DoubleScan
h: width 928 start 976 end 1088 total 1264 skew 0 clock 86.35KHz
v: height 696 start 696 end 698 total 719 clock 60.05Hz
896x672 (0x49) 102.400MHz -HSync +VSync DoubleScan
h: width 896 start 960 end 1060 total 1224 skew 0 clock 83.66KHz
v: height 672 start 672 end 674 total 697 clock 60.01Hz
960x600 (0x4a) 77.000MHz +HSync -VSync DoubleScan
h: width 960 start 984 end 1000 total 1040 skew 0 clock 74.04KHz
v: height 600 start 601 end 604 total 617 clock 60.00Hz
960x540 (0x4b) 69.250MHz +HSync -VSync DoubleScan
h: width 960 start 984 end 1000 total 1040 skew 0 clock 66.59KHz
v: height 540 start 541 end 544 total 555 clock 59.99Hz
800x600 (0x4c) 81.000MHz +HSync +VSync DoubleScan
h: width 800 start 832 end 928 total 1080 skew 0 clock 75.00KHz
v: height 600 start 600 end 602 total 625 clock 60.00Hz
800x600 (0x4d) 40.000MHz +HSync +VSync
h: width 800 start 840 end 968 total 1056 skew 0 clock 37.88KHz
v: height 600 start 601 end 605 total 628 clock 60.32Hz
800x600 (0x4e) 36.000MHz +HSync +VSync
h: width 800 start 824 end 896 total 1024 skew 0 clock 35.16KHz
v: height 600 start 601 end 603 total 625 clock 56.25Hz
840x525 (0x4f) 73.125MHz -HSync +VSync DoubleScan
h: width 840 start 892 end 980 total 1120 skew 0 clock 65.29KHz
v: height 525 start 526 end 529 total 544 clock 60.01Hz
840x525 (0x50) 59.500MHz +HSync -VSync DoubleScan
h: width 840 start 864 end 880 total 920 skew 0 clock 64.67KHz
v: height 525 start 526 end 529 total 540 clock 59.88Hz
800x512 (0x51) 51.562MHz +HSync +VSync DoubleScan
h: width 800 start 800 end 828 total 832 skew 0 clock 61.97KHz
v: height 512 start 512 end 514 total 515 clock 60.17Hz
700x525 (0x52) 61.000MHz +HSync +VSync DoubleScan
h: width 700 start 744 end 820 total 940 skew 0 clock 64.89KHz
v: height 525 start 526 end 532 total 541 clock 59.98Hz
640x512 (0x53) 54.000MHz +HSync +VSync DoubleScan
h: width 640 start 664 end 720 total 844 skew 0 clock 63.98KHz
v: height 512 start 512 end 514 total 533 clock 60.02Hz
720x450 (0x54) 53.250MHz -HSync +VSync DoubleScan
h: width 720 start 760 end 836 total 952 skew 0 clock 55.93KHz
v: height 450 start 451 end 454 total 467 clock 59.89Hz
640x480 (0x55) 54.000MHz +HSync +VSync DoubleScan
h: width 640 start 688 end 744 total 900 skew 0 clock 60.00KHz
v: height 480 start 480 end 482 total 500 clock 60.00Hz
640x480 (0x56) 25.175MHz -HSync -VSync
h: width 640 start 656 end 752 total 800 skew 0 clock 31.47KHz
v: height 480 start 490 end 492 total 525 clock 59.94Hz
680x384 (0x57) 42.375MHz -HSync +VSync DoubleScan
h: width 680 start 716 end 784 total 888 skew 0 clock 47.72KHz
v: height 384 start 385 end 390 total 399 clock 59.80Hz
680x384 (0x58) 36.000MHz +HSync -VSync DoubleScan
h: width 680 start 704 end 720 total 760 skew 0 clock 47.37KHz
v: height 384 start 385 end 390 total 395 clock 59.96Hz
576x432 (0x59) 40.810MHz -HSync +VSync DoubleScan
h: width 576 start 608 end 668 total 760 skew 0 clock 53.70KHz
v: height 432 start 432 end 434 total 447 clock 60.06Hz
512x384 (0x5a) 32.500MHz -HSync -VSync DoubleScan
h: width 512 start 524 end 592 total 672 skew 0 clock 48.36KHz
v: height 384 start 385 end 388 total 403 clock 60.00Hz
400x300 (0x5b) 20.000MHz +HSync +VSync DoubleScan
h: width 400 start 420 end 484 total 528 skew 0 clock 37.88KHz
v: height 300 start 300 end 302 total 314 clock 60.32Hz
400x300 (0x5c) 18.000MHz +HSync +VSync DoubleScan
h: width 400 start 412 end 448 total 512 skew 0 clock 35.16KHz
v: height 300 start 300 end 301 total 312 clock 56.34Hz
320x240 (0x5d) 12.587MHz -HSync -VSync DoubleScan
h: width 320 start 328 end 376 total 400 skew 0 clock 31.47KHz
v: height 240 start 245 end 246 total 262 clock 60.05Hz
VGA-1 disconnected (normal left inverted right x axis y axis)
Identifier: 0x42
Timestamp: 23375
Subpixel: unknown
Clones:
CRTCs: 0 1
Transform: 1.000000 0.000000 0.000000
0.000000 1.000000 0.000000
0.000000 0.000000 1.000000
filter:
non-desktop: 0
range: (0, 1)
link-status: Good
supported: Good, Bad
```

I took a quick glance at the xgalaga source, and it looks to supply
XF86VidModeSwitchToMode() with an unmodified XF86VidModeModeInfo chosen from
the array returned by XF86VidModeGetAllModeLines().

Thanks,
Vito Caputo

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