Intel GMA regression

[iam-alex]

I've got a partly black screen on my netbook with i945GME graphics after update from hrev53658 to latest hrev53759. I attach "kind of screenshot", how screen looks like for me.

[pulkomandy]

There were several commits to the intel_extreme driver in that range:

* 	intel_extreme: disable pipe configuration
* 	intel_extreme: Keep LVDS on its assigned pipe also for SandyBridge
* 	intel_extreme: do not reprogram transcoded/output mapping on ibex point
* 	intel_extreme: do not change panel fitter registers in later devices
* 	intel_extreme: do configure the LVDS panel when we use native resolution
* 	intel_extreme: use panel fitter also for generation 3
* 	intel_extreme: fix pipe and plane size registers
* 	intel_extreme: use the panel fitter for generation 4 devices
* 	intel_extreme: enable LVDS if a VESA panel information is found
* 	intel_extreme: probe DVI port C as well.
* 	intel_extreme: fix PLL limits again

It would be very helpful if you could try some other revisions in that range and try to reduce the interval, so I know which if these changes to focus on. Unfortunately I don't have hardware this old that I can easily use for testing myself, so it's a bit difficult to see and fix regressions there, but I'll do my best.

[iam-alex]

I did. So, regression is between hrev53689 and hrev53692. Hope, it will help. And thank you in advance.

[X512]

In this case cause is likely hrev53690.

[pulkomandy]

Is it fixed by hrev53772? And if not, I think the output of "ie_pipe 0" and "ie_pipe 1" (newly added KDL commands) would help me debug this.

[iam-alex]

Unfortunally, no..

Output of ie_pipe 0:

intel_extreme pipe configuration:
 HTOTAL start 799 end 639
 HBLANK start 791 end 647
 HSYNC start 751 end 655
 VTOTAL start 524 end 479
 VBLANK start 516 end 487
 VSYNC start 491 end 489
 SIZE 639x479
intel_extreme display plane configuration:
 CONTROL: 18000000
 BASE: 10000
 BYTES_PER_ROW: 1000
 SURFACE: 0

Output of ie_pipe 1:

intel_extreme pipe configuration:
 HTOTAL start 1359 end 1023
 HBLANK start 1359 end 1023
 HSYNC start 1191 end 1079
 VTOTAL start 629 end 599
 VBLANK start 629 end 599
 VSYNC start 603 end 600
 SIZE 1023x599
intel_extreme display plane configuration:
 CONTROL: 99000000
 BASE: 10000
 BYTES_PER_ROW: 1000
 SURFACE: 0

Hope there is no mistypes here.

[pulkomandy]

can you try this:

ie_reg 0x70190 0x025703FF
ie_reg 0x71190 0x025703FF

or this:

ie_reg 0x70190 0x03FF0257
ie_reg 0x71190 0x03FF0257

Does any of these 4 commands fix your problem?

[iam-alex]

First pair fix problem (after playing with resolution settings) and gives this output:

intel_extreme register 0x70190
old value: 0x0 (0)
new value: 0x25703ff (39257087)

intel_extreme register 0x71190
old value: 0x257031f (39256863)
new value: 0x25703ff (39257087)

And it goes crazy if I use second pair of commands.

Actually, only ie_reg 0x71190 0x025703FF needed for fix (tested with restart after each command)

[pulkomandy]

Fixed in hrev53787.