Surface Laptop 7 (Qualcomm Snapdragon X Plus) not going into deep idle during Modern Standby, then hibernates too quickly

John Smith 0 Reputation points
2026-07-26T22:16:05.3166667+00:00

Since June 2026 firmware update for my Surface Laptop 7, I noticed that often times it takes a while to wake up. I know the laptop goes into modern standby (S0) by default, and once the battery drains 5% during modern standby it hibernates.

I ran sleep study (powercfg /sleepstudy) and I see it hasn't gone into Deepest Runtime Idle Platform State (DRIPS) at all during standby:

r/Surface - Surface Laptop 7 (Qualcomm Snapdragon) draining battery quickly in Modern Standby then hibernating

The top offender is Qualcomm Bus Device (_SB.UR15). Any idea what this could be? I'm really seeing nothing useful on the sleep report to see what could be causing this.

r/Surface - FX Devices section

r/Surface - Srum Data section

I tried the Airplane mode, but the battery still drains during standby. I also tried Disconnected Standby mode (by running powercfg /setdcvalueindex scheme\_current sub\_none f15576e8-98b7-4186-b944-eafa664402d9 0), but that made no difference.

I'm on Windows 11 Pro 25H2 (26200.8655).

Surface | Surface Laptop | Power and battery
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  1. S.Sengupta 31,626 Reputation points MVP Volunteer Moderator
    2026-07-26T23:54:59.1633333+00:00

    The problem device: _SB.UR15 is a UART bus, not a standalone peripheral — it's almost certainly carrying the Bluetooth radio's UART transport (or possibly GNSS/a sensor). The "Problem Device: TRUE" flag means Microsoft's own tooling has pinned it as what's blocking DRIPS. Airplane Mode/Disconnected Standby didn't help because those control network connectivity, not whether the UART driver is holding a power reference open.

    Suggestions:

    Device Manager → View → Devices by connection → expand _SB.UR15 to confirm what's actually attached to it.

    Test: fully disable Bluetooth in Device Manager, then re-run powercfg /sleepstudy overnight. If UR15 clears up, Bluetooth's UART stack is confirmed as the cause.

    Look for an updated Bluetooth UART Transport Driver or Qualcomm Bus Device package via Windows Update/Surface app.

    Until fixed: leave Bluetooth off overnight or rely on Hibernate instead of Modern Standby.

    File feedback via the Feedback specifically referencing the June 25, 2026, update and the System Manager Device/SCM version — these routes to the Surface engineering team faster than forum posts.

    Watch for the next Surface Laptop 7 firmware release — regressions like this in the System Manager layer are usually caught and patched within one or two cycles once enough sleep-study reports come in.

    In the meantime, using Hibernate instead of relying on Modern Standby is your most reliable workaround, since it sidesteps the DRIPS/power-state issue entirely.

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