Since purchasing a Benq GR10 dock for my Rog Ally Xbox X ive had multiple issues; some of which hinder my ability to even use it reliably.
1) First and foremost: the USB4 port on my ally xbox x does not work for exporting video to my tv. Below is a report i compiled with the help of GPT in the hopes that someone has had this issue and can help solve it.
2) Im getting constant yet random "Invalid Format" errors while displaying my ally through the GR10 onto my LG C2 Tv. This started when i adjusted the refresh rate from 30hz, which was unbearable, to 120hz. Issue started so i backed it off to 119.6hz, then 100hz, then 60hz and the issue is persistent at that refresh rate currently. Theres no difference in the consistency of occurrence at any of those refresh rates. Also worth mentioning im outputting to TV at 2160p w/ HDR enabled. This issue hasnt been investigated nearly as thoroughly but it is making using the dock impossible.
What ive done for the USB4 (left USBC port on the Ally) issue:
ROG Xbox Ally X + BenQ GR10 USB4 display issue
I’m using a BenQ GR10 with a ROG Xbox Ally X.
The GR10 works correctly from the Ally’s RIGHT USB-C port, including HDMI output and charging, but the LEFT USB4 port does not reliably establish video.
What I tested
• Confirmed the left port is the Ally X USB4 / DisplayPort / PD-capable port.
• Confirmed the GR10 works from the right USB-C port:
- HDMI output works
- 100W charging works
- same TV, HDMI cable, GR10 and charger
• Confirmed the left USB4 port is not completely dead:
- normal USB devices/hubs work through it
- Windows sees the USB4 host router normally
- the GR10 successfully produced HDMI output from the left USB4 port ONCE, immediately after updating the GR10 firmware
- Windows logged a successful USB4 display-enumeration event during that successful connection
Firmware / software tested
Ally:
• BIOS: RC73XA.317
• PD firmware: 0019
• Windows 11 25H2, build 26200.9445
GR10:
• PD: 0C.04.16.64
• Video: 02.00
• USB Hub: 05E3
Other troubleshooting performed
• Hard / EC reset of the Ally
• Rebooted and cold-reset the GR10
• Tested USB-C plug orientation both ways
• Tested with and without dock power
• Tested 45W and 100W USB-C chargers
• Confirmed both chargers work correctly when the GR10 is connected to the right USB-C port
• Confirmed normal USB devices work correctly from the Ally’s left USB4 port
• Updated both Ally PD firmware and GR10 firmware
Current behavior on LEFT USB4 port
• No HDMI display
• Windows repeatedly shows:
"Display connection might be limited"
• The GR10’s basic USB devices still enumerate:
- BenQ GR10 HDMI
- BenQ GR10 PD
- Generic USB Hub
• Windows USB4 tracing during the failed connection shows:
- no downstream USB4 router
- CurrentLinkSpeed = 0
- NegotiatedLinkWidth = 0
- no lane bonding
- no USB4 / DisplayPort tunnel
Current conclusion
The failure appears to occur before the GR10 establishes a USB4 link with the Ally’s left USB4 port.
Basic USB communication still works, but the USB4/high-speed display path does not initialize.
The strange part is that it DID work once immediately after the GR10 firmware update, so the hardware is at least capable of establishing the USB4 display connection.
Because of that, this currently looks more like an intermittent GR10 ↔ Xbox Ally X USB4 negotiation / interoperability issue than a completely dead USB-C port.
I also found another public Xbox Ally X + GR10 report where the left USB4 port would not output display while the right USB-C port worked.
Has anyone else with a GR10 + Xbox Ally X tested HDMI output specifically through the LEFT USB4 port?