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Message-ID: <5032DD3A.9030100@xenotime.net> Date: Mon, 20 Aug 2012 17:58:34 -0700 From: Randy Dunlap <rdunlap@...otime.net> To: Dave Airlie <airlied@...il.com> CC: "Justin M. Forbes" <jforbes@...hat.com>, linux-kernel@...r.kernel.org, kernel-team@...oraproject.org, dri-devel@...ts.freedesktop.org Subject: Re: 3.5.x boot hang after conflicting fb hw usage <driver> vs VESA VGA - removing generic driver On 08/20/2012 05:23 PM, Dave Airlie wrote: > On Tue, Aug 21, 2012 at 8:45 AM, Randy Dunlap <rdunlap@...otime.net> wrote: >> On 08/19/2012 10:22 PM, Dave Airlie wrote: >> >>> On Mon, Aug 20, 2012 at 3:13 PM, Randy Dunlap <rdunlap@...otime.net> wrote: >>>> On 08/17/12 15:55, Dave Airlie wrote: >>>> >>>>> On Sat, Aug 18, 2012 at 8:54 AM, Dave Airlie <airlied@...il.com> wrote: >>>>>> On Sat, Aug 18, 2012 at 8:28 AM, Randy Dunlap <rdunlap@...otime.net> wrote: >>>>>>> On 08/17/2012 03:25 PM, Justin M. Forbes wrote: >>>>>>> >>>>>>>> for <driver>, we have verified cases on inteldrmfb, radeondrmfb, and >>>>>>>> cirrusdrmfb. >>>>>>>> >>>>>>>> This is the last message displayed before the system hangs. This seems >>>>>>>> to be hitting a large number of users in Fedora, though certainly not >>>>>>>> everyone. This started happening with the 3.5 updates, and is still an >>>>>>>> issue. It appears to be a race condition, because various things have >>>>>>>> allowed boot to continue for some users, though there is no clear work >>>>>>>> around. Has anyone else run across this? Any ideas. For more >>>>>>>> background we have the following bugs: >>>>>>>> >>>>>>>> inteldrmfb: >>>>>>>> https://bugzilla.redhat.com/show_bug.cgi?id=843826 >>>>>>>> >>>>>>>> radeondrmfb: >>>>>>>> https://bugzilla.redhat.com/show_bug.cgi?id=845745 >>>>>>>> >>>>>>>> cirrusdrmfb <kvm>: >>>>>>>> https://bugzilla.redhat.com/show_bug.cgi?id=843860 >>>>>>>> >>>>>>>> It should be noted that the conflicting fb hw usage message is not new, >>>>>>>> it has been around for a while, but this is the last message seen before >>>>>>>> the hang. >>>>>>> >>>>>>> >>>>>>> Hi, (adding dri-devel mailing list) >>>>>>> >>>>>>> >>>>>>> I started seeing this problem on 3.5-rc6. >>>>>>> >>>>>>> AFAICT, the system is not actually hung, it's just that no output >>>>>>> is showing up on the real (physical) output device (display) -- it's >>>>>>> going somewhere else (or to the bit bucket). >>>>>>> >>>>>> >>>>>> Can we bisect this at all? >>>> >>>> I guess I'll have to try again. My first attempt did not >>>> prove anything, I think because the conflict does not happen >>>> 100% of the time (i.e., it feels like a timing problem). >>>> >>>>>> I worry the intel one will bisect to where we moved the conflict >>>>>> resolution earlier, but I'd like to see if applying that patch earlier >>>>>> causes the issue, since radeon has it. >>>> >>>> Do you know of a specific commit that I could revert and test? >>> >>> 9f846a16d213523fbe6daea17e20df6b8ac5a1e5 >>> >>> might work, but it just changes the timing mostly. >>> >>> also testing 3.4 with that on top would be good. >> >> >> That commit doesn't apply cleanly to 3.4, but reverting >> it on 3.5-rc6 (where I first saw the problem) allows me to boot >> 3.5-rc6 multiple times without a problem. >> >> Maybe Justin can get more stable testing done also.. > > Randy do you have a vga= on your kernel command line? Ah, yes: "vga=ask" -- ~Randy -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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