DVI-D output does not work on PandaBoard Ubuntu image (Linaro 12.3)

[Murat Belge]

I created an Ubuntu image for a PandaBoard ES using Linaro 12.3. When I boot this Ubuntu image on my board with a DVI-D monitor attached, I get nothing on the monitor. The display says there is no signal on the line. Then I tried to add the following bootargs to the boot.scr file "omapfb.mode=dvi:1024x768MR-16@60 omapdss.def_disp=dvi". I then regenerated the boot.scr file using mkImage and rebooted the board. This time kernel panic with the following trace on serial console:

[ 5.955474] omap_vout omap_vout: cannot find display [ 5.960723] omap_vout omap_vout: cannot find display [ 5.966186] omap_vout omap_vout: cannot find display [ 5.971496] Unable to handle kernel NULL pointer dereference at virtual address 0000026c [ 5.980072] pgd = c0004000 [ 5.982910] [0000026c] *pgd=00000000 [ 5.986816] Internal error: Oops: 17 [#1] PREEMPT SMP [ 5.992126] Modules linked in: [ 5.995361] CPU: 0 Tainted: G W (3.1.1-29-linaro-lt-omap #29~lt~ci~20120328002449+1332949706~4f7349b0-Ubuntu) [ 6.007049] PC is at omap_vout_setup_video_data+0x68/0x178 [ 6.012817] LR is at omap_vout_create_video_devices+0xb4/0x1c8 [ 6.019012] pc : [<c0aa3654>] lr : [<c0aa3948>] psr: 20000113 [ 6.019012] sp : ee099e00 ip : ee099e20 fp : ee099e1c [ 6.031127] r10: 00000000 r9 : 00000001 r8 : c0b064a8 [ 6.036651] r7 : ee548b10 r6 : 00000002 r5 : 00000000 r4 : ee57d000 [ 6.043518] r3 : 00000000 r2 : 0000026c r1 : ee57d1bc r0 : ee57d000 [ 6.050415] Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment kernel [ 6.058105] Control: 10c5387d Table: ae59004a DAC: 00000015 [ 6.064178] Process swapper (pid: 1, stack limit = 0xee0982f8)

Removing "omapdss.def_disp=dvi" from bootargs gets rid of kernel panic and Linux boots fine. However, there is no display on the monitor. Tested an HP LCD 23'' monitor and a Sony LC 17''.

[Ricardo Salveti (rsalveti)]

Would be nice to test with a more recent kernel, as this one is not supported anymore by Linaro.

Subscribing the TI landing team to see if they are able to provide any feedback (but please also post the full log and the kernel package changelog, so we know which tree and revision was used).