Yes, that is very much like the problem I encountered, but in my case it did not need multiple monitors to happen, just one. The config file suggested did seem to fix the problem, at least serving as a (hopefully) temporary workaround. Johnny, thanks for the pointer. And thanks to all who replied. P.S. - the workaround seems to work with both the latest "standard" Centos 7 kernel and the ML kernel from the El Repo repository. But today's X11 updates (done before the config file was done) made no difference. On Tue, Apr 7, 2015 at 2:21 PM, Johnny Hughes <johnny at centos.org> wrote: > On 04/04/2015 11:24 AM, Francis Gerund wrote: > > Is there a way in Centos 7 to boot into an alternate video setup? > > > > Some distributions have an option to boot into something called VESA (or > > something similar). Something that might not have the fanciest features, > > but more likely to at least just work. > > > > On Fri, Apr 3, 2015 at 8:58 PM, Francis Gerund <ranrund at gmail.com> > wrote: > > > >> Updated the kernel as suggested to 3.19, did not solve problem. > >> Unbelievable! Oh, well . . . > >> > >> > >> On Fri, Apr 3, 2015 at 8:13 PM, Francis Gerund <ranrund at gmail.com> > wrote: > >> > >>> Okay, thanks to all who took the time to reply. > >>> > >>> What a shame; I hadn't planned on spending Easter weekend learning to > do > >>> kernel upgrades, but . . . here it goes. > >>> > >>> > >>> > >>> On Fri, Apr 3, 2015 at 5:59 PM, Ned Slider <ned at unixmail.co.uk> wrote: > >>> > >>>> > >>>> > >>>> 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. > > > Does this look like your bug: > > https://bugzilla.redhat.com/show_bug.cgi?id=1204610 > > > > > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos > >