RE: [BUG] Intel B580 (e20b) HDMI Flicker & Realtek RTL8922AE 6GHz missing - Mint 22.3

[Ping-Ke Shih <pkshih@realtek.com>]

Chris Russomanno <russomch@aol.com> wrote:
> Hello,
> 
> I am reporting two issues encountered on brand-new hardware using Linux Mint 22.3 with Kernel 6.14.0-generic.
> 
> Hardware Environment:
> - GPU: Intel Arc B580 (Battlemage), PCI ID: [8086:e20b]
> - WiFi: Realtek RTL8922AE (rtw89), Firmware: rtw8922a_fw-3.bin
> - Display: Samsung 4K Monitor connected via HDMI (No DisplayPort available)
> 
> Issue 1: Intel Xe HDMI Flickering
> The Samsung monitor experiences intermittent black-screen flickering (1-2 seconds) at both 4K and 1080p
> resolutions. This behavior is not present on Windows 11.
> Troubleshooting attempted:
> - Added kernel parameters: quiet splash i915.enable_psr=0 xe.force_probe=e20b i915.enable_dc=0
> intel_iommu=igfx_off intel_idle.max_cstate=2
> - Forced "TearFree" and "TripleBuffer" in xorg.conf.
> - Frequency remains at 60Hz.
> 
> Issue 2: Realtek RTL8922AE 6GHz/WiFi 7 Missing
> The card functions on 5GHz (1200 Mb/s) but does not scan or see 6GHz frequencies.
> Troubleshooting attempted:
> - Set regdom to US (iw reg set US).
> - Driver options: rtw89_pci disable_aspm=y, rtw89_core disable_6g=N.
> - 'iw list' does not return any 6GHz/6105 MHz frequencies.

Please share output of 'iw list' before/after setting US. 

In my side (expected) frequencies of band 4 are:

[Before]
                Frequencies:
                        * 5955.0 MHz [1] (disabled)
                        * 5975.0 MHz [5] (disabled)
                        * 5995.0 MHz [9] (disabled)
                        * 6015.0 MHz [13] (disabled)
                        * 6035.0 MHz [17] (disabled)
                        * 6055.0 MHz [21] (disabled)

[After]
                Frequencies:
                        * 5955.0 MHz [1] (12.0 dBm) (no IR)
                        * 5975.0 MHz [5] (12.0 dBm) (no IR)
                        * 5995.0 MHz [9] (12.0 dBm) (no IR)
                        * 6015.0 MHz [13] (12.0 dBm) (no IR)
                        * 6035.0 MHz [17] (12.0 dBm) (no IR)