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Message-ID: <CAPM=9twjpx8kYggKW+ZG39eSzr=Q2nFt2xPKVk5od2HUAexmNw@mail.gmail.com> Date: Tue, 21 Aug 2012 10:23:44 +1000 From: Dave Airlie <airlied@...il.com> To: Randy Dunlap <rdunlap@...otime.net> 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 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? Dave. -- 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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