linux-kernel - Re: [REGRESSION] v4.17-rc4: xgalaga fails to start in fullscreen (default) mode

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Date:   Mon, 21 May 2018 14:57:18 -0700
From:   Vito Caputo <vcaputo@...garu.com>
To:     linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [REGRESSION] v4.17-rc4: xgalaga fails to start in fullscreen
 (default) mode

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.