Felix Miata (offline until ???) changed bug 1179387
What Removed Added
Summary Fubar X with Radeon AGP on Pentium III Coppermine Fubar X with Radeon AGP on Pentium III Coppermine & Katmai

Comment # 13 on bug 1179387 from 
I spent most of the day setting up to respond to comment #11. The PC used for
comment #0 would not POST any more. In addition to the following
troubleshooting itself, I spent a 4.5 hour trip to pick up some spares needed
for troubleshooting these antiques from where I moved from 6 months ago.
Apparently my 21-23 year old original motherboard and my exact match spare will
go no farther than putting a cursor in upper left, no beeps, no POST. My sister
still has one in storage I intend to test. They have Chemicon LXF caps, a
series that had issues through most of the 1990s. If sis' won't POST either I
plan to use some rainy day to recap one of these ancient workhorses.

I did find a mothballed Asus P2B motherboard with 440BX and Katmai Pentium III
CPU. I put in (on the test bench actually) the two PATAs, NIC and Radeon rv250
from the deceased, and it worked, almost. Turns out the ancient BIOS hangs on
an 80G disk, which is where I was booting TW from. So I had to image the
portion of the disk with partitions, then write the image back to a <60G disk.
That enable testing to proceed.

(In reply to Stefan Dirsch from comment #11)
> Hmm. Is 

>  vga=0x317

> no longer set?

I had taken it out to see what would happen without either vga= or video=.

>I believe Takashi wanted to know whether the generic
> framebuffer is still working. So I suggest to try with

>  vga=0x318 nomodeset

> and then hardcode "fbdev" X driver.

# cat /etc/X11/xorg.conf.d/50-device.conf
Section "Device"
    Identifier  "Default Device"
        Driver  "fbdev"
EndSection
# cat /proc/cmdline
root=yada... audit=0 noresume consoleblank=0 mitigations=auto vga=792 5
# inxi -CGISay
System:
  Host: s2846 Kernel: 5.8.15-1-default i686 bits: 32 compiler: gcc v: 10.2.1
  parameters: root=yada... audit=0 noresume consoleblank=0 mitigations=auto
vga=792 5
  Desktop: Trinity R14.0.9 tk: Qt 3.5.0 info: kicker wm: Twin 3.0 dm: TDM
  Distro: openSUSE Tumbleweed 20201127
CPU:
  Info: Single Core model: Pentium III (Katmai) socket: SLOT 1 bits: 32
  type: MCP arch: P6 III Katmai family: 6 model-id: 7 stepping: 3 microcode: A
  L1 cache: 32 KiB L2 cache: 512 KiB
  flags: pae sse bogomips: 1202
  Speed: 601 MHz min/max: N/A base/boost: 600/500 volts: 2.9 V
  ext-clock: 100 MHz Core speed (MHz): 1: 601
  Vulnerabilities: Type: itlb_multihit status: KVM: VMX unsupported
  Type: l1tf status: Vulnerable
  Type: mds
  status: Vulnerable: Clear CPU buffers attempted, no microcode; SMT disabled
  Type: meltdown status: Vulnerable
  Type: spec_store_bypass status: Vulnerable
  Type: spectre_v1
  mitigation: usercopy/swapgs barriers and __user pointer sanitization
  Type: spectre_v2
  mitigation: Full generic retpoline, STIBP: disabled, RSB filling
  Type: srbds status: Not affected
  Type: tsx_async_abort status: Not affected
Graphics:
  Device-1: AMD RV250/M9 GL [Mobility FireGL 9000/Radeon 9000] driver: radeon
  v: kernel bus ID: 01:00.0 chip ID: 1002:4c66
  Display: x11 server: X.Org 1.20.9 driver: fbdev display ID: :0 screens: 1
  Screen-1: 0 s-res: 1680x1050 s-dpi: 96 s-size: 445x278mm (17.5x10.9")
  s-diag: 525mm (20.7")
  Monitor-1: default res: 1680x1050
  OpenGL: renderer: llvmpipe (LLVM 11.0.0 128 bits) v: 4.5 Mesa 20.2.3
  compat-v: 3.1 direct render: Yes
Info:...Shell: Bash v: 5.0.18 running in: konsole inxi: 3.1.09

NAICT with no fbset to use, the vttys are also running in 1680x1050.

> Just using 

>  video=1680x1050

> will set the mode for KMS (kernel mode setting), *not* generic framebuffer
> --> "modeset" X driver.

IME, video= always works for both Xorg and the vttys when xf86-video-intel is
the functioning DDX, and IIRC, with at least one other DDX (not modeset(0)). 

> Also.

>   hwinfo --framebuffer

> will tell you the right mode for native resolution. This is not standardized
> for resolutions > 1280x1024.

Not IME:
# cat /proc/cmdline
root=yada... audit=0 noresume consoleblank=0 mitigations=auto vga=792 5
# hwinfo --framebuffer
02: None 00.0: 11001 VESA Framebuffer
  [Created at bios.459]
  Unique ID: rdCR.1RILOGJ1TcB
  Hardware Class: framebuffer
  Model: "ATI V250"
  Vendor: "ATI Technologies Inc."
  Device: "V250"
  SubVendor: "ATI RADEON RV250"
  SubDevice:
  Revision: "01.00"
  Memory Size: 24 MB
  Memory Range: 0x00000000-0x017fffff (rw)
  Config Status: cfg=new, avail=yes, need=no, active=unknown

(In reply to Takashi Iwai from comment #12)
> Yes, the fbdev should work with a higher resolution, but my intention of the
> previous questions was to confirm that the problem is in radeon DRM
> modesetting (on x86-32).

> Now another question is whether its a kernel regression or not.  If it's a
> regression, which kernel did it work?  We'd need to narrow down the
> regression range.

I can probably rough this out if it is:
# ls -gG /boot/vmlinuz*t
-rw-r--r-- 1 8912448 Oct 20 13:18 /boot/vmlinuz-5.8.15-1-default
-rw-r--r-- 1 8989632 Nov 10 21:35 /boot/vmlinuz-5.9.1-2-default
-rw-r--r-- 1 9002368 Nov 25 14:58 /boot/vmlinuz-5.9.10-1-default
# ls -gG /boot/vmlinuz*e>>out
ls: cannot access '/boot/vmlinuz*e': No such file or directory
# ls -Gg *nel-def*i586*m
-rw-rw-r-- 1 64969681 May  3  2017 kernel-default-4.10.13-1.2.i586.rpm
-rw-rw-r-- 1 65770091 Aug 13  2017 kernel-default-4.11.8-2.4.i586.rpm
-rw-rw-r-- 1 66632511 Aug 30  2017 kernel-default-4.12.9-1.2.i586.rpm
-rw-rw-r-- 1 62262620 Nov 12  2017 kernel-default-4.13.12-1.1.i586.rpm
-rw-rw-r-- 1 63884486 Jan 31  2018 kernel-default-4.14.15-2.3.i586.rpm
-rw-rw-r-- 1 64937625 Apr  4  2018 kernel-default-4.15.13-2.4.i586.rpm
-rw-rw-r-- 1 66163989 Jun 13  2018 kernel-default-4.16.12-3.5.i586.rpm
-rw-rw-r-- 1 66780856 Aug 13  2018 kernel-default-4.17.14-1.2.i586.rpm
-rw-rw-r-- 1 65753138 Oct 24  2018 kernel-default-4.18.15-1.2.i586.rpm
-rw-rw-r-- 1 66394595 Dec 28  2018 kernel-default-4.19.12-1.4.i586.rpm
-rw-rw-r-- 1 66509281 Mar  4  2019 kernel-default-4.20.13-1.2.i586.rpm
-rw-rw-r-- 1 66289238 May 10  2019 kernel-default-5.0.13-1.1.i586.rpm
-rw-rw-r-- 1 67432660 Jul 16  2019 kernel-default-5.1.16-1.4.i586.rpm
-rw-rw-r-- 1 69543814 Sep 21  2019 kernel-default-5.2.14-1.2.i586.rpm
-rw-rw-r-- 1 70420345 Dec 19  2019 kernel-default-5.3.12-2.2.i586.rpm
-rw-rw-r-- 1 69223987 Feb  2  2020 kernel-default-5.4.14-2.1.i586.rpm
-rw-rw-r-- 1 70216327 Mar 29  2020 kernel-default-5.5.13-1.2.i586.rpm
-rw-rw-r-- 1 71691615 Jun  8  2020 kernel-default-5.6.14-1.6.i586.rpm
-rw-rw-r-- 1 72431687 Aug  3 10:44 kernel-default-5.7.11-1.2.i586.rpm
-rw-rw-r-- 1 72638282 Aug  7 05:23 kernel-default-5.7.12-1.1.g9c98feb.i586.rpm
-rw-rw-r-- 1 75437823 Oct 20 14:05 kernel-default-5.8.15-1.2.i586.rpm

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