Resizeable bar reporting

[daevad]

Checklist

• The problem is not listed in the hardware support matrix as a known limitation
• I've included a debug snapshot if the issue is related to hardware configuration

Bug description

Motherboard bios says that resizable bar is Enabled, CPU-X also indicates Enabled. LACT says Disabled.

System info

- LACT version: 0.5.4-release (commit 6dc3520)
- GPU model: AMD RX6800
- Kernel version: 6.8.0-76060800daily20240311-generic
- Distribution: Pop!_OS 22.04 LTS

motherboard - Micro-Star International Co., Ltd. MS-7D53  MPG X570S EDGE MAX WIFI

[ilya-zlobintsev]

At first, I thought that I managed to reproduce this, however, after more investigation it looks like that (at least in my case) resizable bar wasn't actually working (despite being enabled in uefi), and CPU-X was falsely reporting it as enabled.

You can check this with sudo dmesg | grep -i bar, it should output something like

[5.706574] [drm] Detected VRAM RAM=8176M, BAR=8192M

If the BAR value is 256M, then rebar isn't working.

What fixed this for me was disabling CSM/legacy boot in UEFI settings. After this rebar got enabled.

Please check that you aren't experiencing the same situation.

[ilya-zlobintsev]

@daevad any updates on this?