[Intel-gfx] drm-i915-mst + Ubuntu 14.04 + HP 840

[Michal Nazarewicz]

Hi Dave,

I'm trying to get your drm-i915-mst-v3.16[1] branch applied on top of
Ubuntu[2] kernel[3] to get HP's 840 notebook to handle two DPs port on
the docking station but I'm hitting some problems with your patches.  Or
so I think.

If I start and boot with the laptop connected to the docking station and
the screens, I'm getting BUGs (full dmesg attached) and X refuses to
start at all.  E.g.:

------------------------ >8 ----------------------------------------
[   12.493151] [drm:intel_pipe_config_compare] *ERROR* mismatch in adjusted_mode.crtc_clock (expected 119000, found 0)
[   12.493171] WARNING: CPU: 0 PID: 61 at /home/mpn/code/linux/drivers/gpu/drm/i915/intel_display.c:10221 check_crtc_state+0x235/0x350 [i915]()

[   12.503272] [drm:intel_pipe_config_compare] *ERROR* mismatch in adjusted_mode.crtc_clock (expected 119000, found 0)
[   12.503284] WARNING: CPU: 0 PID: 61 at /home/mpn/code/linux/drivers/gpu/drm/i915/intel_display.c:10221 check_crtc_state+0x235/0x350 [i915]()

[   12.503449] [drm:intel_pipe_config_compare] *ERROR* mismatch in adjusted_mode.crtc_clock (expected 119000, found 0)
[   12.503460] WARNING: CPU: 0 PID: 61 at /home/mpn/code/linux/drivers/gpu/drm/i915/intel_display.c:10221 check_crtc_state+0x235/0x350 [i915]()
------------------------ >8 ----------------------------------------

If I boot up with laptop disconnected from the docking station and
connect it later on, I'm getting the following errors:

------------------------ >8 ----------------------------------------
[  248.615216] i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment
[  248.629843] i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment
[  248.630412] acpi PNP0501:00: Still not present
[  252.261562] usb 3-1: new SuperSpeed USB device number 5 using xhci_hcd
[  252.277626] usb 3-1: New USB device found, idVendor=0424, idProduct=5534
[  252.277630] usb 3-1: New USB device strings: Mfr=2, Product=3, SerialNumber=0
[  252.277632] usb 3-1: Product: USB5534B
[  252.277633] usb 3-1: Manufacturer: SMSC
[  252.278047] hub 3-1:1.0: USB hub found
[  252.278067] hub 3-1:1.0: 4 ports detected
[  252.517255] usb 2-1: new high-speed USB device number 16 using xhci_hcd
[  252.645530] usb 2-1: New USB device found, idVendor=0424, idProduct=2134
[  252.645534] usb 2-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[  252.645536] usb 2-1: Product: USB2134B
[  252.645538] usb 2-1: Manufacturer: SMSC
[  252.645970] hub 2-1:1.0: USB hub found
[  252.646024] hub 2-1:1.0: 4 ports detected
[  252.693505] i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment
[  252.704220] i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment
[  252.704478] acpi PNP0501:00: Still not present
------------------------ >8 ----------------------------------------

Needless to say, “xrandr -q” did not detect any of the DisplayPort
screens.

I was wondering if you had any idea what could be a problem?  Perhaps
there is a newer version of your patchset that I should try?

[1] http://cgit.freedesktop.org/~airlied/linux/log/?h=drm-i915-mst-v3.16
[2] Which probably wouldn't by your choice of a distro. ;)
[3] http://kernel.ubuntu.com/git?p=ubuntu/ubuntu-utopic.git;a=shortlog;h=refs/heads/master

-- 
Best regards,                                         _     _
.o. | Liege of Serenely Enlightened Majesty of      o' \,=./ `o
..o | Computer Science,  Michał “mina86” Nazarewicz    (o o)
ooo +--<mpn at google.com>--<xmpp:mina86 at jabber.org>--ooO--(_)--Ooo--
-------------- next part --------------
An embedded and charset-unspecified text was scrubbed...
Name: dmesg-boot.txt
URL: <http://lists.freedesktop.org/archives/intel-gfx/attachments/20141107/fd303cc9/attachment.txt>