[Bug 73133] New: System hangs at X startup on Dell Venue 8 Pro (valleyview / baytrail tablet)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73133

          Priority: medium
            Bug ID: 73133
          Assignee: chris at chris-wilson.co.uk
           Summary: System hangs at X startup on Dell Venue 8 Pro
                    (valleyview / baytrail tablet)
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: blocker
    Classification: Unclassified
                OS: Linux (All)
          Reporter: awilliam at redhat.com
          Hardware: x86 (IA32)
            Status: NEW
           Version: unspecified
         Component: Driver/intel
           Product: xorg

After https://bugs.freedesktop.org/show_bug.cgi?id=71977 , this is the next
problem I'm hitting with graphics on the Dell Venue 8 Pro, a vlv /
baytrail-based tablet. It's pretty simple: if I try and start X with
modesetting enabled, the system hangs completely.

I've checked, and there's nothing useful in any log (X log or journal), even if
I boot with drm.debug=15 . If I boot to runlevel 3 and run 'startx', all I see
is the regular X startup process begins and when it loads the GLX extension,
the system flat hangs. It's always right after GLX extension loads, for
whatever that's worth. When I say 'hangs', I mean I can't get a response to
anything - ctrl-c, ctrl-alt-f2, magic keys, nothing does anything. I can't
check if the system responds to pings as the wireless adapter doesn't work.

I'm sure you'd want more info to debug this, but I'm not sure how I can get any
more! Ideas are welcome.

X starts up fine on the system with modesetting disabled, though of course
that's a very different path and uses a fallback X driver.

Note that I'm doing a 32-bit UEFI boot, which is somewhat unusual and may
relate somehow. All these vlv / baytrail systems have 32-bit UEFI firmwares
(and somewhere, mjg59 is weeping into his gin), so I've hacked up Fedora
somewhat to be capable of 32-bit UEFI boot.

My current test images are built from Fedora Rawhide, which has a very recent X
stack and kernel:

xorg-x11-server-common-1.14.99.904-1.fc21.x86_64
xorg-x11-drv-intel-2.21.15-12.fc21
libdrm-2.4.50-1.fc21.x86_64
mesa-dri-drivers-10.0.1-1.20131220.fc21.x86_64
kernel-3.13.0-0.rc5.git0.1.fc21.x86_64

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