https://bugs.kde.org/show_bug.cgi?id=493674
--- Comment #3 from and...@topazdevelopment.com ---
(In reply to Nate Graham from comment #2)
> 60hz for a 4k screen requires HDMI 2.0 (or later). This means that the GPU,
> computer, cable, and monitor all have to support that version of HDMI, or a
> later one. If any link in the chain does not, then it will degrade to the
> oldest supported version of HDMI, which is likely 1.4. And HDMI 1.4 only
> supports 4K screens at 30hz. So I suspect this is what's happening.
>
> Can you check?
I have used the laptop at 4k@60Hz with other monitors. Same w/the cables.
Everything worked fine on my older ThinkPad. This P16v G2 is new and should do
min 6k, maybe 8k. I'm seeing same behavior on HDMI and DP. Looks like correct
EDID data appears but is not honored:
# monitor-edid
Name: LEN P32p-20
EISA ID: LEN62a2
EDID version: 1.4
EDID extension blocks: 1
Screen size: 69.7 cm x 39.2 cm (31.48 inches, aspect ratio 16/9 = 1.78)
Gamma: 2.2
Digital signal
Max video bandwidth: 600 MHz
HorizSync 30-160
VertRefresh 23-76
# Monitor preferred modeline (60.0 Hz vsync, 133.3 kHz hsync, ratio
16/9, 139 dpi)
ModeLine "3840x2160" 533.25 3840 3888 3920 4000 2160 2163 2168 2222
-hsync +vsync
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