No video when using intel_extreme driver

[ThomasWinwood]

I have a Compaq Evo D510 SFF on which I was running a build of Haiku from a few months back. I decided to upgrade to the latest build, only to be greeted by the video output switching off after the boot process finished.

I brought this up on IRC and followed the suggestion to enable the failsafe video driver, which at least gets me a working system, though at the lower resolution of 1280x1024 rather than the 1680x1050 I enjoyed from the previous build.

I have attached a syslog (which I hope is) from a run using the intel_extreme driver and the output of listdev and listimage | grep drivers as recommended on the reporting-bugs wiki page.

[ThomasWinwood]

Additional information: I did a little walking back through previous nightlies, and the problem has existed since at least hrev51678. I didn't think to make a note of what the working build was, though I doubt it matters.

[diver]

As a workaround you can blacklist intel_extreme and intel_extreme.accelerant, extract them from a working build and put it to non-packaged.

[ThomasWinwood]

Okay, I had some time on my hands so I did some bisecting (to the granularity of the nightly builds available on the Haiku website) and determined that the bug was introduced somewhere between hrev49662 and hrev50357. Any more detailed testing will have to involve someone feeding me custom builds, maybe on IRC or something.

[al_xv]

I also have a Compaq Evo D510 and have the same issue. I didn't have any problems with R1A4.

[kallisti5]

Looks like the issue for Thomas started after the big rewrite in hrev50232.

Here is the core problem per the logs:

intel_extreme: compute_dpll_9xx: best MHz: 1.15743e-12 (error: 107.964)

Something is happening during the PLL calculations.

I added a procedure to run PLL simulations in this commit: ​https://git.haiku-os.org/haiku/commit/src/add-ons/accelerants/intel_extreme?id=699b2cbcf9efc21411e5fd7354427e815aa7b28c

Let me punch the numbers and see what happens.

[kallisti5]

simulation i845G

[waddlesplash]

Please retest after hrev53040.

[pulkomandy]

Duplicate of #14368, please test with the changes listed there in my last comment.

[nielx]

Remove milestone for tickets with status = closed and resolution != fixed