1024x600 screen resolution doesn't work on Acer Aspire AO532h

[sotrud_nik]

(This bug is similiar to ​http://dev.haiku-os.org/ticket/6202)

Tried latest hrev41211 It shows only blank black screen with backlight is on.

It did show the colorfull mess on screen before ​http://dev.haiku-os.org/changeset/41154

Syslog and listdev's outputs are attached.

[sotrud_nik]

listdev's output, AtomN450

[sotrud_nik]

syslog's file, AtomN450

[sotrud_nik]

There was a bugreport about Acer Aspire One AO532h (https://dev.haiku-os.org/ticket/6293), I tried hrev40319 as was suggested there, but no luck.

[sotrud_nik]

I tried to boot Haiku with external monitor plugged in to netbook, and it seems like driver worked. I didn't get native resolution, (which is 1360x768). Haiku set screen resolution to 1024x768. The monitor is Samsung SyncMaster 943 Widescreen.

So, maybe netbook's LCD panel causes the problem? I believe it's AU Optronics 10.1".

(There is an "intel_set_display_mode(1024x600)" string in syslog)

[sotrud_nik]

While looking into source code and logs, I found that there is a wrong pixel clock error. I believe, it's in a compute_pll_divisors function, file src/add-ons/accelerants/intel_extreme/mode.cpp. It looks like getting edid info from monitor failed both on A and C (lvds) ports. Then it falls back to BIOS's mode, which found correctly (1024x600), then requestedPixelClock was set to 7.257 MHz, but required one is 52.0 MHz. I took this value from the xrandr --verbose output, under Linux.

Is it intel_accelerant's, or ddc2_read_edid1's error?

I manually set it to 52.0, recompiled and replaced intel_extreme.accelerant, and it worked. Of course, 1024x600 screen resolution only available.

This bug should be renamed to '1024x600 screen resolution doesn't work on Acer Aspire AO532h'.

[tidux]

On the Asus Eee PC 1005PEB, this happens, except that connecting to an external monitor doesn't work either. This is probably because the default behavior is to clone the middle part of the LVDS display, so when the LVDS display is set to 1024x600, the VGA display is set to 800x600.

[sotrud_nik]

Latest hrev43697 did not work. I've got the Haiku boot screen with 1px-heigth bar at the top. Something was actually happened on that bar, since pixels have blinked, and definitely when mouse pointer was moved.

[umccullough]

Looks like this has affected my (previously working) Acer AOA150 as well.

It uses a i945 chip. I just get the black screen - booting in fail safe video mode gets me vesa 800x600 at best.

I can binary-search the revision that causes this if necessary. Other seemingly-related tickets: #8132, #9145, and #9157 which may be duplicates of this problem.

[umccullough]

Replying to umccullough:

I can binary-search the revision that causes this if necessary. Other seemingly-related tickets: #8132, #9145, and #9157 which may be duplicates of this problem.

My issue was resolved with the workaround mentioned in ticket #9157, but this ticket seems to pre-date the hrev mentioned there

[waddlesplash]

Please retest after hrev53040.

[tidux]

My netbook hardware died years ago so I am not able to re-test.

[nielx]

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