[CentOS] video problem since 2015-04-01 update

[Ned Slider]

On 03/04/15 20:41, Francis Gerund wrote:
> Well, it could be the same, but the bug report does seem to refer to the
> bug being in kernel series 3.18.  I am just using whatever 3.10 series
> kernel comes standard with Centos 7.x.
> 

Well, the CentOS kernel is a 3.10 kernel in name (or number) only. Red
Hat backport much stuff from later kernels, and in this case that
includes much broken code for the Intel i915 driver. The code is broken
from around 3.15 and still not completely fixed in the current 4.0-rc6
code base. Updating to a newer kernel, and hence a newer i915 driver,
may or may not help, but it doesn't hurt to try.

> I don't know anything about bug reports, and I an not familiar with
> swapping out kernels in Centos.
> 
> BTW, is El Repo another name for the EPEL repository?
> 

No, they are two completely separate repositories:

http://wiki.centos.org/AdditionalResources/Repositories

> 
> 
> On Fri, Apr 3, 2015 at 1:07 PM, Akemi Yagi <amyagi at gmail.com> wrote:
> 
>> On Fri, Apr 3, 2015 at 10:30 AM, Francis Gerund <ranrund at gmail.com> wrote:
>>> Hello!
>>>
>>> No updates for days until 2015-04-01.  Then presented with huge steaming
>>> pile of updates all at once, apparently related to Centos 7.1 release.
>>
>>> After reboot, there is a problem with the video.  It seems to flicker
>> when
>>> the mouse pointer touches the screen edges.  Also, sometimes when viewing
>>> pages in Firefox, the window becomes partially covered with horizontal
>>> black lines.
>>>
>>> During reboots, before the login screen appears, there are quickly
>>> disappearing messages seeming to include references to "drm:9" and some
>>> sort of "underrun".
>>>
>>> In the terminal window, I get a message:
>>>
>>> ABRT has detected 3 problem(s). For more info run: abrt-cli list --since
>>> 1428078184
>>>
>>> When I do that, I get:
>>>
>>> id (blah, blah)
>>> reason:         WARNING: at drivers/gpu/drm/i915/intel_display.c:869
>>> intel_wait_for_vblank+0x211/0x220 [i915]()
>>> time:             Fri 03 Apr 2015 11:41:49 AM CDT
>>> cmdline:        BOOT_IMAGE=/vmlinuz-3.10.0-229.1.2.el7.x86_64
>>> root=UUID=(blah, blah) ro vconsole.keymap=us
>>> vconsole.font=latarcyrheb-sun16 rhgb quiet LANG=en_US.UTF-8
>>> count:          1
>>> Directory:      /var/tmp/abrt/oops-2015-04-03-11:41:49-590-0
>>
>> Does this kernel.org bug look similar to yours?
>>
>> https://bugzilla.kernel.org/show_bug.cgi?id=86771
>>
>> I suggest you try kernel-ml from ELRepo and see if that fixes the issue.
>>
>> Akemi